Trail du Bugey

The Trail du Bugey is a 45-kilometer race with 2,200 meters of elevation gain, starting from Ambérieu-en-Bugey in the Ain department. The Bugey, a little-known territory wedged between the southern Jura and the Rhône valley, is a tangle of cluses, combes, and limestone plateaus offering spectacular trail terrain. Often called the "little Jura" or "secret Jura," the Bugey possesses a karst relief that multiplies cliffs, caves, resurgences, and rocky gorges.

The course crosses the most remarkable landscapes of this southern Jurassian mountain. Runners climb the flanks of limestone ridges that structure the Bugey as a succession of parallel folds, separated by narrow, deep cluses. Trails skirt white limestone cliffs, cross centuries-old boxwood forests — among the finest in France — and follow open ridges with views extending to the Alps, Mont Blanc, and the Rhône valley. Passages through the Albarine gorges and the defiles cutting into the massif provide powerful moments along the course.

The 2,200 meters of elevation gain are imposed by the succession of straightforward climbs to plateaus and ridges, followed by steep descents into the cluses. The limestone terrain is demanding: sharp lapiaz, slippery slabs in wet weather, unstable scree, narrow balcony trails above the void. The boxwood forests, magnificent but treacherous, conceal roots and stones beneath a carpet of tough leaves. In winter and early spring, overnight frost can transform altitude trails into fearsome ice rinks, adding a dimension of caution to the progression.

Ambérieu-en-Bugey is a crossroads town located at the entrance to the Bugey, at the confluence of the Albarine and the Ain rivers. The town, an important railway junction on the Lyon-Geneva line, offers practical access to this preserved natural territory. The surroundings abound with remarkable sites: the Château des Allymes, a medieval fortress perched on a rocky spur overlooking the Ain plain; the Cerdon caves, where a unique rosé sparkling wine is produced; and the Bugey vineyards, a small confidential appellation producing white wines from the altesse grape of remarkable finesse.

For international runners, the Trail du Bugey is the discovery of an authentic and preserved French territory, just one hour from Lyon and Geneva. The Bugey captivates with its spectacular karst landscapes, generous gastronomy — pike quenelles, crozets gratin, Bleu de Gex cheese — and the warm welcome of its inhabitants. This race is an excellent choice for trail runners seeking significant elevation gain and technical terrain in a remarkable natural setting, without the crowds of major Alpine races.